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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a677398276e45c18a297ee2be9b3e097e4ca99b2da1b7d0ddf04fdd70cc266' 
  AND token = 'Xn0O/7moxFgRgufZtd7Q4Z+lBw0u76pw/n9u8tohv6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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