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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5425314b7b9f010a6e75db697df1ebbe096cd3be9d27d9acddb3953ff0f4e3ef' 
  AND token = 've884FT0ifaEQRyPt9gR7eCGLOqfmTsCd51IbepSP8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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