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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d3aba6c346b5659707bbc1d2acebc6aef04235b4f7b949da724bb1f19ae97c' 
  AND token = 'B4bS0C9w84Kmw6UzeK3yiRF9NJhauGY0Ysdt+t5T6lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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