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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03514214445732b279ef5dd8fc469d52d6776091bc0e60549b0ad78f99d7aff6' 
  AND token = 'INGTsf0CXrXpGuB4BTdNW+mr0wLQ2eSylnhqsguLfA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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