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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccec3f736a4ef76dac002bdd2e8cf5cd82b77f81083cf3ea0b7cd08950a23f5' 
  AND token = 'FqjwVcsKJ8Pizme/IsxvOLve+owm184uysH0mTp8uZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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