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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f7044bdc234be352b593f0c4ed41c151d40b04bbaadb6a922518b6a137af28' 
  AND token = 'bPTqWSP7/usNQzyLW0403fgkw6SWxC6Jo+D20MrikyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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