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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c814402b25c1dff854d90b68cef2dd2d422cffcca269a1d95a7b41b5caa8115' 
  AND token = 'Ch2D8KIZJPxHeq2OaGJtk/l6TMi/408tSUyO6CzF+w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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