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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8becc1e26055d77d2e4d7e75fdfc592442656e2339142727ac9d71a3806b75' 
  AND token = 'FbytRzUVj5gOEZlo/wRL3wtHUa5EyDfGbb8cMJGTVvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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