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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a216522682f79c8d868d270ec103bbcf7c85bffdf9cf0a10675669dc021365c7' 
  AND token = '7Jkvk3Xf7ixmFe0DnPYsLu9oPNSKF1VpNXkRrNuOevo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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