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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb40fdcc907c59f326d72ca30b8899a2a15dfa367a4dd5ce75814a49ac794a99' 
  AND token = 'LQG7EfZjjdC/ycW/HPu7XY1i99PHjwyJ/ZQrxA1TJTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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