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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7767a75dd4ce4bc143f03133ba0d81c08d6bbeec1692f1f773701221c80dfb' 
  AND token = '2xymIGBESvqhb/1mm2L79yt+tSBcJmzgfqTQ+jSrTRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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