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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57415ede47e0253daec5fca102a96e6d7144935ebae9803c704a830ae0179ccd' 
  AND token = '9KXzWfxQaI8MxCtIYsx6k8s7R0oZU9FmIDkciZ1PA3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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