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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f411c14b4684536be716036f3eadc08ee2c06dd7e8bbb84ebf6bf2e8bf5c25f' 
  AND token = 'iX0fy3gouXCcCtMFF35FSpOQvMfIiGCqCHejaEEVB8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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