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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407e06bedf2205644ae2b62597d6ea18e42f7c0da41207e3af515057e16a6bd8' 
  AND token = 'hAFep+IEp6tSmnUIFFE3hxqJYSo2P0gzLwOQjyEqhYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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