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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5007481d3e7ffd0b6e81588e4f1c0b0ec0cfb8f72fadfea24ec0a9f540aec1f3' 
  AND token = 'P9B2xluVpwkzPrgeuCL7cDjqoRo41ZP2iYGp/KqMT0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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