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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3097c1df5d94a8d6b86b1f4942f409b4a2add295b3a1ff74f6af709ce5c879' 
  AND token = '5RgfFYDxS8DCqrvs8A5sYklU6rBTixaQCUuk7RYihME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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