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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69307186533b482e816b38591847b54b5d7ee0a1e7443d1e75b4410bfbdaca0c' 
  AND token = 'CUNfJWbR5axIt3F5KM3ZYpFrayPa+L9f37QmPR2CbbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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