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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0e24a34241b2188909908d87cbe3cde391d71a76342c6ae4cc37f8ce19dc19' 
  AND token = 'v/oNQog6+d/ZwlapVT5gZryfKuXNHMsds3kKNJNz9C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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