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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641fa01ac0040d424871177018b83765323c29b05162abd10a7f98a5e46254db' 
  AND token = 'w6gBJbCWHSIjLprxfkkfccbxHwxHoFXR2dj7FdO+cDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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