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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e4b620ec887d9ffb6fbbb544283d7d2f2714839fd762e9700fb994d21f887b' 
  AND token = 'Dv6NsR9fciH8nU0ibEA8f91aAJbVrso7PgiAvdJeRYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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