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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8e96ab03b82d6d708d3cfe1f84b4792efc3d5fbae0653e33cdb8f9884f4117' 
  AND token = 'UtHo4me68ORXcV/2T/n0LNTu5f0j1Cq16SICfBgoGA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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