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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbc9527ed4db821a47e7986b07f9e68d41327b5708d384f841612cfd104dd4c' 
  AND token = 'iY4CQLfoN4fs07KG9QB5Ehhzq2OPRdJcHOWXJfsxnw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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