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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305fe0523c6319b96f05144745dd5df1af993eda5c9b46261cc9732ef3ed1f4d' 
  AND token = 'BmLGQ4vB5i/muqAtVW6TNIXBfMvNi0uCUDRmXxmgzUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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