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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a6bf18c60a2c4696b3a83d7838ed6efcd39808c501c33fa133ca523d52f8b7' 
  AND token = 'kjl/HvLTD6o0Xy8N8RLtBd1zHZxp5upHJ7bW/nXDcXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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