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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cdab1805ff3c4add1abec405eb57faee07e981e3566ea8df3e740eb697217ca' 
  AND token = 'FUZAb5OQyxx9NALgbsODa0xoS2Ci57qRyfjNwPuF3Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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