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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f99af93e60e71cb41f6bec7b3709c3b8c40c4309b97d9e54191133334225e6' 
  AND token = 'BZDcUtgwtzS346cDMqS270ZP+XXoXkOfXbdLaqNN4Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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