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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0da29f6c4d18dae25450d3b6657dd1193c19875f6b04e2a4e17c08161998585' 
  AND token = 'BkAje3tHZg4eLo+0RjKl1zOcE9eQWCsNTsCXrR+t0qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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