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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4b98dd323617f7f63bf08ef05c039af3ea6213891bddd54f93ff07903e06d1' 
  AND token = 'Lm6ytLggd0uDZVzFpk3giX9TlI1Wx5iinOXxzVVKVSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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