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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846356d468a1c2f16f581edbd2716578f0fd70fe45869412b35b5c7f0a1300f4' 
  AND token = 'M9EcDNDyPHZqOUPPhogZr/Y4WDDey6BenyW/jbG3ioY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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