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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4678884e8ba2215a19a8e01316c6f2c90f52b37719356e33b32fe59d3a4b81' 
  AND token = '3EFVJdQ19/e93EL28TvS1RJFBs/SmGLMyz5ervP3xAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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