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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d6e7ef6b9d63c12998b577f6b691efa1e0e205e9ddc1987a66995d29762a57' 
  AND token = 'dEagXszC/DqDXRpn69QwBgwPb43XM1Stclycifo5VpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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