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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f0ba1ea2c45e4e19d8efc33a7126c74dfbb6fdb74dff9804d481f08419be0a' 
  AND token = 'rfb0SO2dbevITRKQMdaKEKxJgb53MAroaXV4JWR5ozg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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