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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9195bcce46ffb1545bd32fa8e494a3b27042803a9a66363383e5c58ec5b80d' 
  AND token = '3NP8jxfvh9opTCUllso06Iv52EQH5nIEERDHwQ0dr4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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