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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10a584c8128ffeef2a3bc35aa7c99ac5f8e1503153c9712e2deb70a990e8b90' 
  AND token = 'vKEFZmN2otkNBad/7wqAjymb1s9Arqn2YIfcPEOBGMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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