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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d52014f872dfa32f5df845550db1acc0a3d8f4e9d2ceeb7b31324130833fc4' 
  AND token = '8qjDspmsIXM5T7Vv8M19bIHKjpH+jE4wuuhPqUsKA3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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