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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531fe17e2531e086775579870b58f3aec1af7b61644ec9e6adedcb421e3c0381' 
  AND token = '0/X7ybJEmcwONBvZHHEfoLUtAxfMlM61LSwhpFLHExw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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