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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c2731ba75347acb374d2255a12512c1846ec4c5ef8f9f5d687bda69705bbe7' 
  AND token = 'C3t4ZG/57mcOFBi5Q3ZR7jLF4CN4hR7NTzMJqWUSoPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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