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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671a456f816c3eac44f86af960fa6609567a6755fe1ed8476fabeae8fdad8f47' 
  AND token = '/KG/f5992TU/OU+OTURTaVvKsCmUmxjDGijB2StcNOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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