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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb52bf4da75f3056f3a2ac376a99e07ef653754d3c7513a4573328e6aaa3de0' 
  AND token = 'wrKD9uE/36wr3QblNS29+AFO/Skqda4R21ppp41g9VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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