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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996b243fdbbf599d2d5000cb8ac1a92b638663b1adb1900068685f379a55c27d' 
  AND token = 'M73GMPTpz42+aUe9LeJFn7L0W5+rHySQjKsGwHR+h/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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