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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62318e6c59fa9ca65147aae384cd5a720b393febfd710bcc7083ded082cfc765' 
  AND token = 'zBbC4pus+4ARXTRuITWJB6JEL47xYJm3j1ZY6UdkquA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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