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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b12e28d868e98affde0c5d67e3c5d927c2b818a58386f71a1f3b0ad6e6eb5e3' 
  AND token = '7AqHyPsTfVaHoTmlj1ks2dhCtwMXaFMDJeONVE1oMbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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