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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17572ab41ee1d377e87ec4d3d10d9ecdca416dc33447cdbceaa6f7069eaa959a' 
  AND token = 'VvrHuHKrLhtlJH3qMa8UZneN6B989ep/y2pkiOzprTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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