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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88aa860aafb3a4ff526226aa26f18a7eb6be73cc441d5b5133e700c21a634234' 
  AND token = 'UFbJiGi8WOrO9N6sr12zj1f7eBscXsEIkgFwGV6WoUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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