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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a968467eb01947a07e03407fe34ca18de1f9e173a3c594d38d9fdb1799087f4b' 
  AND token = 'N895qQ+WCNgMvc8cNV1/rjVvSjohqXhwkcUNqNhyK6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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