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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfb7b57ec15f8982c5337a98c5727d1de391e28b7d10c408fddae8459838e8a' 
  AND token = 'Mjp5eFs91RfScYGLlbueOjUVDFbV7HDWlOK/LUR7fo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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