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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f7597e7a51d0b6bdc549ca99913a99ad7aaa628143acbe969f4b5ce20ed258' 
  AND token = 'T1j0aBGCJjIxVyCcsTb88mx8m68g6nNL5CryuI6qDuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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