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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0d55263c4eff2ae5f328d2190ff319cca1a75ac323a3ce27d7f2ede43c69f0' 
  AND token = '/bRAFZvYAa1d8TDW1z2MAb0+bMP132+jtKXuc1jwdHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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