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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5418b66a4433e7e19d9830554e554b0b1803fafa9a02d29f76dc0eb9b9f8db32' 
  AND token = 'i4LcqylnHZR1Afywe4SWLzfmKsmcHEh8BTWNDG8Pv6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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