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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662ac2f0d4dd178a5af2d93af712a081c57b58d995000597688acbaa74672d4b' 
  AND token = 'Upl2iYp8NPQkqihlkaJMYlg7IA/bTT8O8ZvF7JAhmE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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