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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec69d6ecd3337e783e54e529ea165f17c07dddf464bc1128aa63dc2f92ce037' 
  AND token = '0Zo0ovW3UsuWk7IYarKQKg9KiX3JIpQjEGQA6cQv9zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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