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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc0eb24bc972156552500c5f488f541af0ba7dd7b3076c66e44d6934c2d93e0' 
  AND token = 'GHlcHO5q7vCV1b3duvTA5ODo6MIWQtsxLWAUypRETBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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