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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737b594322e618c09a1f1651967fdf1f92ba7e7d4012b1a05125f0538dc0ca17' 
  AND token = '3/ZqYfecSou9QWDWUckDRZv/Pexlj0XPCBkGvXsf0Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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