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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbad1c6f80becc564236d8344f35b1714118b062f2e93bcc65b4aa0bf5c2943' 
  AND token = '+dqBIUquwZ7bSaVnYSXbn0rsQuLUcjGANRT2PjSlyL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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