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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a54ed1f02d2f6a8f5a4222d80542d53f2bcdb5fe124386f249e3dfc32d97729' 
  AND token = '/SZcwmt8lpqgeAm9MEDVbo/RUe1os3YV1JJ8oL9QH60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}