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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfad6d0cfbe8776976efcd1e757ea817a51a9b486a5ac8f7a7b6a1d8b53de962' 
  AND token = '4MxLX+Nce/0S/2EJSeZtPONiXTj6vxpKYSHiP1NbfWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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