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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f54c03a13a9cc59e62d3ca7f4ffefe7b11ef0c55a7b775d8f9a7060dcf52dd0' 
  AND token = '9p1jwiF0JHH0f3V6FIQ3iSq8djDrgXRWSvthrchsLNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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