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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c30d2972e3bac85ee61e75d98453e6cd2ba7ff485ec65451ec06a9eb53e872' 
  AND token = 'VsjIaG4fyiUXt8hv273mWOkoiWWomm4ZVk5Oi5r5RA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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