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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b15d1093799067aaa145e5e6e332c9fc147a9bae4c6af392080b5d28225ee17' 
  AND token = '7atQRwd4lkVtfh1d+Oh/Tfy0E6LHGyLNg2waxwRoZx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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