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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba1a0a4b961d7105054ea8b064b396124c65c007017e1a1ddd94b43c6d6ed49' 
  AND token = 'TeKdWhI4Q4haT+HNh0gHd6DE9vcJLP6NWAar1drZXWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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