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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0c2b61a1b9e66b33dee1d3752d0fbca4e05364a979f878ef9a8957cc9d2406' 
  AND token = 'jR/iSL9+5HEn4LN0suyLDbfD2iwazGpxG15HG3tf2W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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