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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbf0a006e15c3d28b75e30b64e8369f4efb58a734936115704e86f3f98100f2' 
  AND token = 'QOZn8HIhaEumXALFXUZepl5xr4dZILPb2bmtaIkdhqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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