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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6663811431c3dd60a0add99bbe17ed8294305a3a4613e95c42967f64dcaa12' 
  AND token = 'uSI3Dcod50Trc9+5pfmazdLB+r0FK/4N8J+U5Yp5Q3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00134

JSON explain

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